Kundu, P and Pal, D and Sen, Suchitra (1988) Preparation and thermal evolution of sol-gel derived transparent ZrO2 and MgO-ZrO2 gel monolith. Journal of Materials Science, 23 (5). pp. 1539-1546. ISSN 0022-2461

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Abstract

Transparent gel monoliths of pure and MgO-doped zirconia having dopant concentrations in the range 0 to 15 mol % were prepared by chemical polymerization of zirconium n-propoxide and magnesium acetate tetrahydrate using 2-methoxy ethanol as solvent. The thermal evolution of amorphous gels was studied by differential thermal analysis, X-ray diffraction and transmission electron microscopy. The crystallization of pure and doped zirconia gels occurred in the temperature range 360 to 450° C. The first crystalline phase to appear is tetragonal for pure and 2 mol % doped zirconia, and cubic for 3 to 15 mol % doped samples. Both crystallization and decomposition temperatures are found to increase with increasing dopant concentration, approaching a saturation value for 10 mol % doped samples. It has been established that the transformation of the cubic to the monoclinic phase takes place via a metastable tetragonal phase. A linear relationship between the lattice parameter of cubic zirconia and MgO concentration has been established. X-ray diffraction studies have also revealed that the entire amount of MgO used in preparing doped zirconia gels remains in a single MgO-ZrO2 crystalline phase formed initially by thermal treatment.

Item Type:	Article
Subjects:	Engineering Materials
Divisions:	UNSPECIFIED
Depositing User:	Namita Dutta
Date Deposited:	08 Nov 2013 07:18
Last Modified:	18 Mar 2016 17:29
URI:	http://cgcri.csircentral.net/id/eprint/2201

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